Your knees may suffer descending the 300 or so steps to this secluded beach (signposted – though poorly – from the village of Panza), but a wallow in the warm thermal waters should revive them. The water naturally emerges at high temperatures, and then is ameliorated by the waves. There's a loo here, and a summertime cafe.
The beach can also be reached by water taxi from Sant'Angelo (€7 one way).